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AT25SL321

DS-25SL321–112H–2020-10

8.36 Read Serial Flash Discovery Parameter (5Ah)

The Read Serial Flash Discovery Parameter (SFDP) instruction allows reading the Serial Flash Discovery

Parameter area (SFDP). This SFDP area is composed of 2048 read-only bytes containing operating

characteristics and vendor specific information. The SFDP area is factory programmed. If the SFDP area is blank,

the device is shipped with all the SFDP bytes at FFh. If only a portion of the SFDP area is written to, the portion

not used is shipped with bytes in erased state (FFh).

The instruction sequence for the read SFDP has the same structure as that of a Fast Read instruction. First, the

device is selected by driving Chip Select (CS) low. Next, the 8-bit instruction code (5Ah) and the 24-bit address

are shifted in, followed by 8 dummy clock cycles. The bytes of SFDP content are shifted out on the Serial Data

Output (SO) starting from the specified address. Each bit is shifted out during the falling edge of Serial Clock

(SCK). The instruction sequence is shown here. The Read SFDP instruction is terminated by driving Chip Select

(CS) High at any time during data output.

Figure 8-58. Read SFDP Register Instruction

Table 8-9.

SFDP Signature and Headers

Description

Comment

Address

(h) Byte

Address

(Bit)

Data (b)

(Bit)

Data (h)

(Byte)

SFDP Signature

00h

07:00

0101 0011

53h

01h

15:08

0100 0110

46h

02h

23:16

0100 0100

44h

03h

31:24

0101 0110

50h

SFDP Minor Revision

Start from 00h

04h

07:00

0000 0110

06h

SFDP Major Revision

Start from 01h

05h

15:08

0000 0001

01h

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